Die stop for punch presses



June 5, 1945.

s. STROBL DIE STOP FOR PUNCH PRESSES Filed Feb. 18, 1943 7 In Me 22561:56%6/5570ZZ- Patented June 5, 1945 UNITED STATES PATENT OFFICE urn STOPFOR PUNCH PBESSES Samuel 'Strobl, Chicago, In.

' Application February 18, 1943, Serial No. 476,358

2 Claims.

This invention relates to die stops for punch presses for controllingthe feeding action of stock as it is fed through the die to position thestock for successive working strokes of the press to insure thatopenings? cut in the-stock will be umformly spaced apart. One object isto provide a I universal stop that is automatic in operation and adaptedfor'use on any blanking die.

A further object is to provide a stop of this type that is adapted forapplication to presses of different sizes, styles and types withoutalteration of the press or disfiguration of the same. A still furtherobject is to provide a stop that is adjustable longitudinally andtransversely of the line of travel of the stock thus making itapplicable to be used on any blanking die.

A still further object is to provide a stop that is positive andefficient in operation, simple in construction, durable in use and thatis readily applied to and removed from the press when desired.

With the foregoing and other objects in View the invention consists inthe combination and arrangement of parts to be hereinafter fullydescribed, pointed out in the claims and illustrated in the accompanyingdrawing which forms a part of this patent, and in which-- Fig. 1 is aview of the stop illustrating its application to a conventional punchpress. I

Fig. 2 is a side view of'Fig. 1.

Fig. 3 is a view in elevational perspective of he stop showing only afractional portion of the press frame to which two of thestop-supporting brackets are secured, an altered position of certain ofthe manually adjustable parts of the stop being shown in dotted lines,and,

Fig. 4 is an enlarged fragmentary view showing the stop-repositioningelement comprising one end of the stop.

Like reference characters denote corresponding parts throughout theseveral views.

The present invention is adapted for use upon punching machines or powerpresses of the class embodying a reciprocable tool carrier I mounted ina frame l and carrying the tool 2 and movable toward and away from a dieblock 3 On which is disposed the die 4 through which the stock 5 is fed,the die having mounted thereon the strip per plate 6.

Secured to opposite sides of the frame and to the front thereof are thebrackets 1, 8 through which the control rod 9 freely extends, the endsthereof extending a short distance beyond their respective brackets,said rod being positioned a short space above the stripper plate andbelow the tool carrier in the topmost position of the same andrearwardly beyond a straight line connecting the rear edges of the toolcarrier and said stripper plate to provide tool carrier clearance.

Collars ll, [2 fast upon the rod 9 between the brackets I, 8 are sopositioned relative thereto as to limit the extent of the axial thrustof said rod in both directions, said rod at one end having fastthereupon the disc l3 that is connected to the bracket 8 by the coilspring M, the ends of said spring being fast in said disc and bracketand the spring coiled about said rod, said spring serving yieldingly toretain said rod in a position to keep the collar H in disengagedrelation with the bracket 1 and collar l2 in engaged relation with thebracket 8, this rod and collar position being clearly shown in Fig. 1,said spring also exerting a slight twisting or rotating movement to saidcontrol rod 9.

Adjustably arranged upon the rod 9 is the coupling block i5 adapted tobe locked in any desired position by means of the screw l5 extendinginto one end of said block for engagement with said rod. Also extendingthrough block 15 at right angles to the rod 9 is the finger-bar I! thatis adjustable longitudinally when not engaged by the screw 18 arrangedin the lower end of said block, said finger-bar having at its forwardend the downturned angular finger l9 adapted for engagement with thestock 5.

The finger-rod extends rearwardly from said coupling block beneath butin direct line vertically with the head of the tappet 20 that is carriedby the link 2| and that is adjustable vertically toward and away fromsaid finger-rod, said tappet being preferably threaded and engaged withathreaded perforation in said link and being provided with adjusting nuts22 upon opposite sides of said link; Link 2| is secured by screw orpin,23 to a bracket 2 said screw being adjustable longitudinally inbracket slot to provide horizontal adjustment of said link and of saidtappet. The bracket 24 is secured directly to the tool carrier 1 withwhich it moves or reciprocates. Normally the downturned end of thefinger-rod iskept yieldingl in engagement with the stock by the spring[4. In Fig. 3 altered positions of the coupling block and finger-rod areshown in dotted lines. Varied positions of these members are made toaccommodate the stop to stock of different shapes and designs.

In the normal position of the stop the downturned end of the finger-baris in full line position, Figs. 1 and 2, in engagement with the stockand the collar l2 contiguous to the bracket 8,

while the collar II is spaced from the bracket 1. With the finger-bar inengagement with the stock or with the wall of one stock perforation,movement of the stock is arrested. The tool carrier is now in raised orpartly raised position. As the tool carrier descends for engagement withthe stock the tappet 20 descends therewith. Engagement of the tool withthe stock is followed immediately by engagement of the tappet with therear end of the finger-bar thus raising the downturned end thereof fromthe stock and permitting another advance of the stock. This movement ofthe finger-bar also tilts the coupling block slightly causing the sameto impart a slight rotary motion to the rod 9 thus slightly twisting thespring 14 which will thrust the said rod axially or longitudinally. Asthe tool holder moves upwardly after its work stroke the tappet willrelease the finger-bar and the spring l4 again contracting willreposition the rod, finger-bar and coupling block to normal with thefinger-bar engaging the newly punched out portion of the stock and beingyieldingly so retained by said spring I 4 ready for the next work strokeof the press.

What is claimed is:

1. In a die stop for punch presses, a control rod, brackets freelyconnecting said rod to the press frame, collars fast upon said controlrod immediately adjacent said brackets for alternate contact therewithas said rod is moved axially in opposite directions, a disc fast to oneend of said control rod, a spring upon said rod connecting one bracketto said disc, a finger-bar, a coupling block connecting said finger-barand control rod adjustably, a tappet disposed above said fingerbar inline therewith vertically, and a bracket carried by the press toolcarrier adjustably carrying said tappet.

2. In a die stop for punch presses, a control rod, brackets freelyconnecting said rod to the press frame, collars fast upon said rodadjacent said brackets for alternate contact therewith as said rod ismoved axially in opposite directions, a finger bar, a couplingadjustably connecting said finger bar and control rod for transmittingmovement from one to the other, a tappet carried by the press toolcarrier for actuating contact with said finger bar at the end of theworking stroke of the tool carrier, and means connecting one end of saidrod to one of the aforesaid brackets for imparting a longitudinal thrustand return movement to said rod after each couplingtransmitted movementthereof.

SAMUEL S'I'ROBL.

